Safety device for elevators



Nov. 17 1925.

N. L. MONROE SAFETY. DEVICE FOR ELEVATORS Filed Feb. 24, 1925 f/ H F 6 om EP /0 Y /3 vpatentarNov. 17, 192s'.

ES-i NORMANl LEWIS MONROE, oF BUcYnUs, oHIo.

SAFETY DEVICE FOR ELEVA'TORS.

Application led February. 24, 1925. Serial No. 11,283.

To all whom it may concern:

Be it known that I, NORMAN LEWIS MoN- RoE, a citizen of the United States, residing at Bucyrus, in the county of Crawford and State of Ohio, have invented certain new and useful Improvements in a Safetv Device for Elevators, of which the following is a speciication.

The present invention relates to a device for stopping an elevator should the lifting cable thereof become broken or the drum therefor become out of order so as to let the elevator drop.

The invention contemplates provision of a device of this nature which is simple` etlicient, reliable, strong, durable, not liable to get out of order, effective, inexpensive to install, and otherwise well adapted for the purpose for which it is designed.

With the above and other obiects in view as will appear as the description proceeds, the invention resides in certain novel features of construction, and in the combination and arrangement of parts as will be hereinafter more fully described and claimed.

In the drawing The ligure is a Sectional view through an elevator shaft showing the features of my invention. y

Referring to the drawing in detail it will be seen that S designates an ordinary elevator shaft having the elevator E movable therein by means of a cablel C trained over the pulley P supported on the crossbar B. A circuit closer is mounted on this cross bar B and includes a iiXed contact 5 and a rockable Contact 6 on one end of which is journaled a pulley 7 engaged with the cable' C. A spring 8 urges the rockable contact so that should the cable C break or the drum become loose so as to allow the cable to become slack, the spring 8 will actuate the rockable contact into engagement with the fiXezd'con'- tact 5 for closing a circuit which will be described in detail later.

At every other story in the building, or at numerous or less numerous intervals the shaft S is provided with openings 10 in its sides. Two of these openings are arranged opposite each other and have stops 11 therein. As these stops, and the operating mechanism therefor are identical I shall merely of the kshaft and operate sprockets over which are trained chains 18, also ltrained over the sprockets provided on the up-permost shaft 16. Other similar chains 19 are trained over other sprockets on the shaft 16 of the uppermost worms 14 and trained over sprockets'on other shafts 16 therebelow so that upon energization of the motors 17 the worms 14 will be rotated for ractuation of the arcuate rack bars 13 thereby pushing the stops 11 so that they will swing out into the shaft S into the path of the elevator and stop downward Vmovement thereof. These motors 17 are wired in series and the circuit closer previously described is disposed in the wire 20. A Wire 21 leads from one motor to the line wire 22 and another wire 23 leads from the other motor to the line wire 24. y

It will be apparent from the above description that I have provided a simple and efficient safety device which will be eHective inpreventing a lengthy fall of the elevator should anything happen to the cable or the operating mechanism therefor. The present embodiment of the invention which I have described in detail has been given merely by way of example and will attain all ofthe features of yadvantage enumerated as desirable in the statement of the invention and the abovedescription but it is desired to point out that numerous changes in the details of construction, and in the combination and arrangement of parts may' be resorted to Vwithout departing from the spirit or scope of the invention as hereinafter claimed or sacrificing of its advantages.

Having thus described my invention, what I claim as new is 1.- In combination, an elevator shaft, an elevator mounted in the shaft, a cable for operation of the elevator, a circuit closer 'nsY sol

controlled by the cable, a motor in circuit with the circuit closer, and Stops actuatably by said motor and operable to be moved thereby across the path of the elevator in of the classfdescri'bed It including a hingedly mounted member,4 an

arcuate rack bar extendingr therefrom, a Worm rotatably mounted and meshing. With the rack bar, and means for rotating the 10 Worm.

In testimony whereof I affix vmy signature.v

` -NORMA'LEWIS' Moulton. 

